<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8" />
		<title>DOM操作-练习</title>
		<style type="text/css">
			body {
				font-size: 13px;
				line-height: 25px;
			}
			
			table {
				border-top: 1px solid #333;
				border-left: 1px solid #333;
				width: 300px;
			}
			
			td {
				border-right: 1px solid #333;
				border-bottom: 1px solid #333;
			}
			
			.center {
				text-align: center;
			}
		</style>
		<script src="https://cdn.bootcdn.net/ajax/libs/jquery/3.6.0/jquery.min.js"></script>
		<script>

			//增加
			//219970413刘慧
			function addRow() {
				var fRow =$("#row3");//创建行节点
				var newRow =$("<tr></tr>"); //创建单元格节点

				var col1 =$("<td>幸福从天而降</td>");//为单元格添加文本
				var col2 =$("<td>&yen;18.50</td>").attr("align","center");
			
				col2.css("text-align","center");
				col1.appendTo(newRow);//把单元格添加到行节点中
				col2.appendTo(newRow);
				fRow.before(newRow);//把行节点添加到表格末尾
			}
			//修改
			function updateRow() {
				var uRow =$("#row1");
				//标题行设置为字体加粗、文本居中显示，背景颜色为灰色	
				uRow.css({
					fontWeight:"bold",
					textAlign:"center",
					backgroundColor: "#cccccc",
				});
			}

			//删除
			function delRow() {
				var dRow =$("tr"); //访问被删除的行
				if(dRow[2]!=null){
					$(dRow[2]).remove();//删除行
				}
			}

			//复制
			function copyRow() {
				var oldRow = $("#row3");//访问复制的行
				var newRow =oldRow.clone(true);//复制指定的行及子节点,添加true使复制过的还能继续复制	
			$("#myTable:last").append(newRow);//在指定节点的末尾添加行
			}
		</script>	
	</head>
	<body>
		<table border="0" cellspacing="0" cellpadding="0" id="myTable">
			<tr id="row1">
				<td>书名</td>
				<td>价格</td>
			</tr>
			<tr id="row2">
				<td>看得见风景的房间</td>
				<td class="center">&yen;30.00</td>
			</tr>
			<tr id="row3">
				<td>60个瞬间</td>
				<td class="center">&yen;32.00</td>
			</tr>
		</table>
		<input name="b1" type="button" value="增加一行" onclick="addRow()" />
		<input name="b2" type="button" value="删除第2行" onclick="delRow()" />
		<input name="b3" type="button" value="修改标题样式" onclick="updateRow()" />
		<input name="b4" type="button" value="复制最后一行" onclick="copyRow()" />
	</body>
	
</html>
